热塑性聚氨酯复合材料薄膜的制备及其性能研究

Study on Fabrication and Performance of TPU Composite Films

利用纵向氧化切割多层碳纳米管(MWCNTs)制得氧化石墨烯纳米带-碳纳米管(GONRs-CNTs)2种维度纳米杂化材料,用异氰酸苯酯对GONRs_((67%))-CNTs纳米杂化体进行表面化学修饰制得功能化GONRs_((67%))-CNTs(pGONRs-CNTs,GONRs质量分数为67%),探究了pGONRs-CNTs对热塑性聚氨酯(TPU)薄膜阻隔、力学和降解性能的影响。结果表明,改性后所得pGONRs-CNTs杂化体表面变得模糊而粗糙,亲油性得到明显提高,有利于其在聚合物基体中实现均匀稳固分布。当pGONRs-CNTs含量为0.5%(质量分数,下同)时,TPU/pGONRs-CNTs材料相比纯TPU材料的氧气透过率(OTR)低63.08%,拉伸强度高46.55%,其对应的阻透性能与力学性能均有较大程度提高;而且,由于pGONRs-CNTs物质的使用,使TPU材料的使用寿命延长。

A novel method was adopted to modify TPU with the nanohybrids consisting of two-dimensional graphene oxide nanoribbons(GONRs)and one-dimensional carbon nanotubes(CNTs).The GONRs-CNTs nanohybrids were obtained with a weight fraction of GONRs of67wt%through oxidative longitudinal unzipping for MWCNTs,followed by a modification with phenyl isocyanate.The functionalized GONRs-CNTs(p GONRs-CNTs)/TPU composite films were then prepared by a solution coating method using a coating machine.The effect of p GONRs-CNTs content on the barrier,tensile and degradation properties of the composite films was investigated.The results indicated that p GONRs-CNTs were well dispersed in the TPU matrix with a neat shape and low defect due to its strong interfacial adhesion with TPU.When0.5wt%of p GONRs-CNTs was incorporated into TPU,the composite films achieved the optimium barrier and tensile properties,in which the oxygen transmission rate decreased by63.08%and the tensile strength increased by46.55%compared to those of pure TPU film.In addition,the addition of p GONRs-CNTs also improved the serving time of the composite films.